Spirit of Malevolence

• WWizards of the Coast2020-06-23
  Official Ruling
  If your life total is brought to 0 or less at the same time that Spirit of Malevolence is dealt lethal damage, you lose the game before its ability goes on the stack.
• WWizards of the Coast2020-06-23
  Official Ruling
  In a Two-Headed Giant game, Spirit of Malevolence's ability causes the opposing team to lose 2 life and you to gain 1 life.

Rulings via Scryfall